US329447A - Tool-holding attachment for lathes - Google Patents

Description

(No Model.)

W. PREOH.

TOOL HOLDING ATTACHMENT FOR LATHES.

Patented Nov. 3, 1885.

2 Sheets-Sheet 1.

MM Join/k 2 SheetsSheet 2.

W. FREOH.

TOOL HOLDING ATTACHMENT FOR LATHES. No. 329,447.

(No Model.)

Patented Nov. 3, 1885.

N. PETERS. Pholo-Lilhographor. WashiugiomDC.

UNITED STATES PATENT OFFICE.

WILLIAM FREGH, OF CHICAGO, ILLINOIS.

TOOL-HOLDING ATTACHMENT FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 329,447, dated November 3, 1885.

Application tiled July 30,1884. Serial No. 139,192.

To all whom it may concern.-

Be it known that I, WILLIAM FREOH, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Automatic Vertical Turret-Heads for Lathes, of which the following is a specification, to wit:

This invention relates to an improvement in automatic vertical turret-heads for lathes; and it consists in certain peculiarities of the construction and arrangement of the head and its operating mechanism, substantially as will be hereinafter more fully set forth and claimed.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the accompanying drawings, in which Figure l is a perspective view of a lathe having my invention attached to its tail-stock, the tail-stock as ordinarily used being shown detached in the same figure; Fig. 2, a plan View of the turret-head and tail-stock; Fig. 3, a front elevation ofthe same. Fig. 4 is a de tail vie-w 0f the device for operating the head, and Fig. 5 is a detail of the pawl which operates the looking device of the head.

A represents a lathe-bed of the ordinary and well-known form, having a head-stock, A, and tail-stock A as usual, both of which are adjustable upon the bed in theordinary manner.

Turret-heads are usually secured in a horizontalposition upon a stock or frame which takes the place of the tail-stock, and I desire to arrange the head upon the usual tail-stock found upon all lathes, and do this in the following manner: I provide a small frame, B, clamped or secured upon the tail-stock by a single bolt, b, entering a hole, b, in the face of the stock, as shown. This frame is formed with two forwardly-projecting arms or ways, B B, upon which slides a cross-head, O, the outer ends of which clasp the ways B upon all sides, as fully seen in Fig. 3, and thus move firmly and accurately, without any tendency to twist, and retain the dies in proper alignment with their work, as will be presently seen. This cross-head is secured to the spindle a of the tail-stock by means of a set-screw,

(No model.)

0, and is moved backward and forward by this spindle during the operation of threading or screw-cutting, as hereinafter more fully described. Pivoted upon a horizontal bolt or shaft, 0, of the cross-head is the turret-head D, preferably of circular form, and provided with a series of sockets or holes, d, passing through it near its periphery, in which the dies are clamped by set-bolts D, passing through the sides of the head, as shown in the drawings. These bolts project from the head a short distance, and are each formed with a short section, 01, free from screw-threads, which serve to engage a hinged arm, E, to operate the head at proper times in its movement. This arm E is hinged upon an offset, 0, of the frame B, below the turret, and projects forward and across the machine a sufficient distance to engage one of the lower screw-pins or set-bolts, D, upon the backwardmotion of the crosshead, the hinged arm being formed with a shoulder, e, engaging the main portion of the frame at this time, and holding it firm. while the pressure of the projecting pin is upon it. Behind the rear end of the hinged arm E is a spring-actuated pin, e, socketed into and projecting from the frame B, and this springpin allows the free forward motion of the arm during the corresponding motion of the crosshead and turret, while it at once returns the arm to position when released. The outer side of I a small arm, projects into this notch from thespring-catch G, which lies just above it. Upon the way or guide-arm B is a hinged pawl, h, the outer end of which lies against a stop pin or projection, z, of the way. The

' pawl is wedge-shaped on its point, as at h, and

has a short straight portion, h near its heel, for a purpose presently seen. The shaft h. of

this pawl passes through the way B, forming a pivot upon which the pawl turns, and is on its lower end furnished witha spring, i, toreturn IOO - after being released.

motion of the cross-head the point of the i tail-stock of a lathe, having guides B, proit to position after operation, The hand-wheel used upon the rear end of the spindle a of the tail-stock is removed for using the attachment, and a small rod or shaft, M, substituted, in the outer end of which is fulcrumed the operating-lever M, the end of which is connected by a link, m, with a projection. or arm, m, clamped upon the tail-stock,as in Fig. 1. This arm is provided with a bolt or screw, magainst which strikes a stop-lug, n, on the rod M, and serves to limit the sliding motion of the device. I

But a minute is required to attach the device in the manner described to the tail-stock of'a common lathe, and it is then ready for use incutting screw-threads, either outside-or inside dies being: clamped in the head,.as may be desired. lathe-position shown in Fig. 1 theheadis' held by the spring-catch, with one ofv its dies in line with the work to be operated upomwhich is secured in the head-stock in l the turret-head 1), formed with sockets-d, the 5 set-bolts D, having a short plain portion, d,

the *usual way, The cross-head is-now pushed forward by the operating-lever, its arms passing over the pawl h,which is turned aside and springs back to place at once. The turret head inpassingforward during this motion en gages and turns the outer end of the hingedarm E, which is also at once returned to place Upon the backward pawl h passes behind the arm 9 of the springcatchand draws it back to release the head. The set-pinFD on thelower side of the head now engagesthe inclined arm E, and sliding along this arm turns thehead, the catch G being held back. by the straight portion of the pawl h till ,the. head is started, and is then released, bearingagainst the head till it again falls into,

, one of: its-notches and locks the turret with the next diaein position. This operation is repeated tillal'l or as'many as desired, of the dies have: been; used, and a new piece of work is then; placed inposition: to be operated upon. It wiili thus: be seen that any one or allof the dies maybe used at will, and the turret may be: set atany point by simply drawing. back. the catch and turning the head by hand.

' By applying the attachment to the usual tailr-s'tock: much expense is saved, and the de maticallyturning it as-it ismoved to and fromthe work,.substantially as andfor the purpose setfortm.

2. The combination, with the tail-stock of a lathe, of a guide-frame secured to the stock, a cross-head sliding thereon and secured to the spindle of the tail-stock, a turret-head pivoted upon the cross-head, socketed for the reception of the dies, and provided with screws for clamping the dies which project from the side of the turret, a spring-catch engaging notches in the turret .to hold it in position, a

sockets for receiving the dies, and provided with projecting set-screws for securing them, in place, in combination with an incline or I arm onthe frame B, against which'the pro j ecting serewsstrike torevolve the head, sub stantiall'y as and for the purpose set forth.

4.- Ina screw-cutting attachment forlathes,

and the cross-head G, slidingon guidesor ways to and from the work, in combinationwith the f e, and the spring=pin e, "socketed in theframe and bearing against the arm, substantially as 1 and; for the purpose set forth,

5. The frame B, removably clamped; to; the

vided with a pivoted spring-pawl, h, in combination witha cross-head sliding upon said ways, and a pivoted turret-head, I), thereon,- formed with notches on its periphery, and the spring-catchGr, having an arm, g, engaging the pawl on the guides, substantially as and for' the purpose set forth,- I

6. In ascrew-cutting attachment for-lathes, the tail stock provided with a removable frame,-B,.having the hingedspringarmE, and the guides B",:carrying the pivoted spring-pawl h, in combination with the cross=head -"O, at tached to the tail-spindle, the turret-head D, pivoted uponsaid cross-head, and formed with sockets d,- n'otches d,- and set-screws D, the spring-catchG,-recessed in one arm of the-crosshead, and provided with an arm, g, for engagement with the pawl h to release the turret, the shaft M, attached to the rear" end .of the spindle, the operating-lever M, pivoted on the end of said spindle, and the opposite end hinged to the frame, the set-bolt n, andnstoplugn for limiting the-motion ofthe cross-head, all constructed and arranged to operate substantially as and for the purposeset forth.

In testimony whereof I affix my signature'in presence of two witnesses.

VVILLTAM FREGH.

Witnesses: V v

CHAS. KREssMA -N,

WM. 0. MGARTHUR;

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